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Simplifying 5x + -1(2x + -3) = 21 Reorder the terms: 5x + -1(-3 + 2x) = 21 5x + (-3 * -1 + 2x * -1) = 21 5x + (3 + -2x) = 21 Reorder the terms: 3 + 5x + -2x = 21 Combine like terms: 5x + -2x = 3x 3 + 3x = 21 Solving 3 + 3x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + 3x = 21 + -3 Combine like terms: 3 + -3 = 0 0 + 3x = 21 + -3 3x = 21 + -3 Combine like terms: 21 + -3 = 18 3x = 18 Divide each side by '3'. x = 6 Simplifying x = 6
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